(A) Midventricular septal native-T1 time demonstrates a significant correlation with septal thickness (Pearson’s ρ = 0.50, P = 0.001), (B) but not regional extracellular volume fraction (Pearson’s ρ = 0.28, P = 0.086). (C) No correlation was observed between regional MTR and either septal thickness (Pearson’s ρ = 0.19, P = 0.23) or (D) regional extracellular volume fraction (Pearson’s ρ = 0.23, P = 0.16).